Diplom-Informatiker

ii In memory of my father Isaac To my mother Betti iii Modern Web Services applications encompass multiple distributed interacting components, possibly including millions of lines of code written in different programming languages. With this complexity, some bugs often remain undetected despite extensive testing procedures, and occasionally cause transient system failures. Incorrect failure handling in applications often leads to incomplete or to unintentional request executions. A family of recovery protocols called interaction contracts provides a generic solution to this problem by means of system-integrated data, process, and message recovery for multi-tier applications. It is able to mask failures, and allows programmers to concentrate on the application logic, thus speeding up the development process

der Universität des Saarlandes Approximate Information Filtering in Structured Peer-to-Peer Networks

for Informatic

der Naturwissenschaftlich-Technischen Fakultät I

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